Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f53eac4f8f1aa1f…

MALICIOUS

PDF

95.6 KB Created: 2021-09-14 14:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37de139a623049bba7640d05e5037357 SHA-1: fe495240795814da9b2f5b129327a44e697440c4 SHA-256: 3f53eac4f8f1aa1f7f1b34e31c7c2cc66a013132ac454ee956664417e2eec7dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, likely intended to lure users to phishing sites or download further malware. The PDF's structure and embedded URLs suggest it is part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5404

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=how+to+put+a+skin+on+an+app+android PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613658b26b50b---53896091083.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/jizololesatasixozesodowar.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/68624058905.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/repatalexoxujilotema.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/paviniwatokeralada.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/sazikidasizetarum.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137edaa492e9---muzaponibiravexudaligerak.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/97273205217.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/rumoxefaji.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jarazuxumojeriko.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/64002285005.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e0b8b28b0c9babbf6c4e3b74b4e2e2e9/tujijuv.pdfIn PDF document text
    • http://kaies.net/upfiles/210905192512383074pyg81r.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/6796995467.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/senigozipuzizepokifod.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/votutopekegixasit.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/sobutubotegim.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7ea5ec887cf4a794a0f38c96beee4f15/sizutivi.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/dubijikanu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 18696 bytes
SHA-256: 7a4016cda1c48cbddc6f256c0430562d7417c9513f56b408da8cee1a679e5627
font_01_sfnt_off00016186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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